MADISON, Wis. (AP) — A new report from the U.S. Department of Agriculture shows Wisconsin farmers experienced a slight increase in production costs last year.

Figures show that the average farm spent more than $168,000 on production in 2017, a 6 percent increase from the previous year. Some of the largest expense increases were for trucks, tractors and other farm machinery, which saw spending declines in 2015-16.

Mark Stephenson is the director of the Center for Dairy Profitability at the University of Wisconsin-Madison. He told the Wisconsin Public Radio that farmers had avoided making large purchases during the last few years of low commodity price.

"It may be the case that some of that equipment simply can't be fixed anymore," Stephenson said. "Any one or two years, you can get by not replacing it. But four years? Some equipment is going to have to be replaced."

Sherry Wuebben of St. Joseph Equipment said the company has seen fewer sales in the last few years. She said she's concerned sales could go down even further due to President Donald Trump administration's tariffs on steel and aluminum.

"After years of not having any significant price increases, because of the tariffs on steel, (buyers) are going to start seeing some price increases," Wuebben said.

She said she isn't sure how much equipment prices will increase, but manufacturers have already notified her that costs will change.

But Simon Jette Nantel, assistant professor of agricultural economics at UW-River Falls, said labor costs will likely be what influences spending in the coming year.

He said the Trump administration's focus on limiting immigration has caused wages to increase in the dairy industry.

"There's always this trade off between labor and capital," said Jette Nantel. "One alternative to (paying high labor costs), and we're witnessing some of that with some dairy farmers adopting robotics, is that instead of labor you choose to replace that labor with more capital investment."

He said increasingly advanced technology could help farmers reduce the number of employees that they need.